EP2698383A1 - Nachweis von synthetischen Cannabionoiden - Google Patents

Nachweis von synthetischen Cannabionoiden Download PDF

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Publication number
EP2698383A1
EP2698383A1 EP12180486.8A EP12180486A EP2698383A1 EP 2698383 A1 EP2698383 A1 EP 2698383A1 EP 12180486 A EP12180486 A EP 12180486A EP 2698383 A1 EP2698383 A1 EP 2698383A1
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Prior art keywords
antibody
homologue
immunogen
crosslinker
antibodies
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French (fr)
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EP2698383B1 (de
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Stephen Peter Fitzgerald
Paul John Innocenzi
Ivan Robert Mcconnell
Philip Andrew Lowry
Elouard Benchikh
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Randox Laboratories Ltd
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Randox Laboratories Ltd
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    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
    • C07K16/44—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material not provided for elsewhere, e.g. haptens, metals, DNA, RNA, amino acids
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/94—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving narcotics or drugs or pharmaceuticals, neurotransmitters or associated receptors
    • G01N33/948—Sedatives, e.g. cannabinoids, barbiturates
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/30—Immunoglobulins specific features characterized by aspects of specificity or valency
    • C07K2317/33—Crossreactivity, e.g. for species or epitope, or lack of said crossreactivity
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K2317/00—Immunoglobulins specific features
    • C07K2317/90—Immunoglobulins specific features characterized by (pharmaco)kinetic aspects or by stability of the immunoglobulin
    • C07K2317/92—Affinity (KD), association rate (Ka), dissociation rate (Kd) or EC50 value

Definitions

  • a problem for governments and drug enforcement agencies is that, even after identifying and banning a new synthetic cannabinoid, the manufacturers can rapidly react to the banning by incorporating a different active analogue into the same or a different herbal product; targeted minor changes in the molecular structure of the known active compound can preserve receptor activity but often produces a molecule whose GC-MS/LC-MS (the commonly applied detection techniques) profile is completely different from the original active molecule.
  • the new active molecule initially remains unidentified and a further resource intensive and costly chemical analytical study to enable structural characterisation is required.
  • the main active ingredients highlighted in SSC products to date are JWH-018, CP 47,497 and JWH-073 (Uchiyama et al. 2010; Hudson et al.
  • CP refers to synthetic cannabinoid molecules comprising the unfused bicyclic structure II, in which X is either ethyl, n-propyl or n-butyl, as well as, metabolites thereof.
  • Herbal therapeutics have been analysed using solvent extraction, pre-derivatisation and finally GC-MS analysis in SIM mode (Rana et al. 2010). This method is inadequate for the detection of future and 'current' JWH and CP SSCs (it is conceivable that 'current' herbal therapeutics, as well as CP 47,497, incorporate CP SSCs that are not yet characterised), requires sample pre-derivatisation, specialist staff for its implementation and expensive equipment.
  • the Inventors devised a novel method based on novel antibodies raised from novel immunogens. The antibodies underpin an effective analytical and economic solution to the detection and quantification of current and future CP CB 1 -active molecules in in vitro patient samples and herbal therapeutics.
  • the invention describes a rapid and practical method for the detection and determination of known and/or stealth synthetic cannabinoids based on the CP drug family. Kits and their use for CP SSC detection and determination in herbal therapeutics and in vitro patient samples are also described. The invention is underpinned by novel immunogens and antibodies which enable said methods, kits and applications.
  • an antibody which binds to an epitope of structure: wherein X is selected from n-propyl and n-butyl.
  • X is selected from n-propyl and n-butyl.
  • the definition of X is intended to embrace the CP-47,497 (C 7 homologue) and the CP-47,497 (C 8 homologue).
  • the antibody of the first aspect of the invention binds to an epitope selected from the group consisting of a racemic mixture of ( ⁇ )-CP-47,497 (C 7 homologue), a racemic mixture of ( ⁇ )-CP-47,497 (C 8 homologue), a stereoisomer of CP-47,497 (C 7 homologue) and a stereoisomer of CP-47,497 (C 8 homologue).
  • the antibody of first aspect of the invention is further characterised by having a B/B 0 of ⁇ 50% for the epitope of Claim 4 (standardised with ( ⁇ )-CP-47,497 (C 8 homologue) and using tracer 1 (C 7 ).
  • the antibody of the first aspect of the invention is further characterised by being raisable against one or more immunogens of the following structures
  • the accm is an antigenicity conferring carrier material
  • the crosslinker is a functionalised linking group joining the accm to the remainder of the molecule, the crosslinker of structure (e) forming either a single or double bond to the cyclohexyl ring and the crosslinker of structure (c) extending from the 4, 5, 6 or 7-position of the indole ring.
  • the antibody is raisable against the immunogen of structure (e) and having a B/B 0 of ⁇ 50% (standardised with ( ⁇ )-CP-47,497 (C 8 homologue) and using tracer 1 (C 7 ).
  • Q which is attached to the accm
  • M is a C 1-10 substituted or unsubstituted straight chain alkylene or arylene moiety
  • the antibody is raisable against the immunogen of structure (e), in which the immunogen of structure (e) is selected from the group consisting of and
  • the antibody is raisable against the immunogen of structure (e), in which the immunogen is
  • a method of detecting or determining synthetic cannabinoids of the CP family and/or one or more metabolites thereof in an in vitro sample of an individual or in a solution derived from a substance suspected of containing synthetic cannabinoids comprising contacting the sample or solution with one or more detecting agents and one or more antibodies of the first aspect of the invention; detecting, or determining the quantity of, the one or more detecting agents; and deducing from calibrators, the presence of or amount of a molecule or molecules of the CP family and/or metabolites thereof in the sample or solution.
  • kits for detecting or determining a molecule or molecules of the CP family and/or one or more metabolites thereof comprising one or more antibodies of the first aspect of the invention.
  • the invention also discloses one or more immunogens possessing the following structures
  • the accm is an antigenicity conferring carrier material; m is 1 - 3; and the crosslinker is a functionalised linking group joining the accm to the remainder of the molecule.
  • crosslinker incorporates atoms that enable it to bond to both the accm and the CP moiety, forming a bridging group.
  • structure (e) the crosslinker forms either a single or double bond to the cyclohexyl ring.
  • the crosslinker concept is well known to the person skilled in immunogen synthesis.
  • the nature and length of the crosslinker follows standard methods in order to optimise hapten epitopic recognition by the antibody. This entails a crosslinker of low immunogenicity and a chain length preferably of no greater than about ten atoms, most preferably no greater than six atoms.
  • the skilled person is aware that, for these antibodies to recognize CP molecules, they must bind to particular structures or epitopes of the hapten (in this context the hapten being that part of the immunogen that is not the crosslinker or accm); the epitopes are often distinct groups incorporating functional groups.
  • Another aspect of the invention is an antibody raisable against an immunogen of structure (e), (f), (g) or (h), the antibody being able to bind to molecules of the CP family, metabolites of CP molecules and future SSC molecules comprising structure II.
  • the antibody is raisable against an immunogen of structure (e), the antibody being able to bind to molecules of the CP family, metabolites of CP molecules and future SSC molecules comprising structure II.
  • the word specific in the context of the current invention refers to the analyte that is preferably bound by the antibody, as gauged by a suitable metric such as the IC 50 . Given the IC 50 of various analytes their cross-reactivities can be calculated.
  • the antibody can either be a polyclonal or monoclonal antibody using well-known methods. If the polyclonal antibody possesses the required specificity and sensitivity, that is, it binds a single analyte within the detection range of the assay, development of a monoclonal antibody is unnecessary.
  • One or more antibodies of the invention can be incorporated into a kit for the detection and semi-determination of individual or multiple SSCs.
  • the skilled person in the immunodiagnostic field is aware of several alternative immunoassay formats that could incorporate the antibodies of the invention either in solution or tethered (e.g. covalently bonded or electrostatically 'non-bonded' through Van der Waal's forces) to a solid substrate such as beads, glass/plastic slides or ceramic chips (a chip defined as a small, planar substrate).
  • a preferred solid substrate onto which the antibodies of the invention are covalently bonded is a chip, preferably a ceramic chip; the word 'biochip'TM can be used to refer to a chip with antibodies attached.
  • the invention also provides a solid substrate, preferably a biochip, comprising antibodies raisable against an immunogen of one or more of structures (e), (f), (g) or (h), the antibodies being able to bind to an epitope of one or more molecules of the CP family and/or one or more metabolites thereof.
  • a solid substrate preferably a biochip, comprising antibodies raisable against an immunogen of structure (e), the antibodies being able to bind to an epitope of one or more molecules of the CP family and/or one or more metabolites thereof.
  • the detection and determination criteria for a SSC using an immunoassay platform includes, as is well-known in the art, exceeding a pre-defined cut-off/concentration value or measuring the calibrator equivalent value as derived from a calibrator curve (also referred to as a standard curve).
  • Another aspect of the invention is a method of detecting or determining synthetic cannabinoids of the CP family and their metabolites in an in vitro sample of an individual or in a solution derived from a substance suspected of containing synthetic cannabinoids comprising: contacting the sample or solution with one or more detecting agents and one or more antibodies of the invention that bind to molecules of the CP family, and detecting or determining, by reference to calibrators, the presence or concentration of a molecule or molecules of the CP family.
  • the method further comprises a step of measuring the detecting agents before detecting or determining, by reference to calibrators, the presence or concentration of a molecule or molecules of the CP family.
  • the detecting agents measuring step can be measuring detecting agent bound to the antibodies, the detecting agent being labeled antigen in a competitive, homogeneous immunoassay in which unbound, labeled antigen is measured.
  • the detecting agents measuring step can be measuring detecting agent bound to the antibodies, the detecting agent being labeled antigen in a competitive, heterogeneous immunoassay in which bound, labeled antigen is measured.
  • the detecting agents measuring step can be measuring detecting agent bound to the antibodies, the detecting agent being labeled antibodies in a one-site, noncompetitive immunoassay in which bound, labeled antibodies are measured.
  • the detecting agents measuring step can be measuring detecting agent bound to the antibodies, the detecting agent being labeled antibody that is bound to the antigen that is, in turn, also bound to the antibody.
  • 'detecting' means qualitatively analyzing for the presence or absence of a substance
  • 'determining' means quantitatively analyzing for the amount of a substance.
  • the detecting agent is a small molecule, generally of similar structure to a molecule to be detected conjugated to a labelling agent, the detecting agent being able to bind to one of the antibodies of the invention.
  • the labelling agent is selected from an enzyme, a luminescent substance, a radioactive substance, or a mixture thereof.
  • the labelling agent is an enzyme, more preferably a peroxidase, most preferably horseradish peroxidase (HRP).
  • the luminescent substance may be a bioluminescent, chemiluminescent or fluorescent material.
  • the patient sample to be used for in vitro analysis can be hair or a peripheral biological fluid but is preferably whole blood, serum, plasma, or urine.
  • kits for detecting or determining a molecule or molecules of the CP family comprising one or more antibodies of the invention.
  • the kit comprises one or more antibodies raisable against an immunogen of structure (e), (f), (g) or (h) of Group II. More preferably, the kit comprises one or more antibodies raisable against an immunogen of structure (e) of Group II.
  • the antibodies of the kit are preferably tethered to any suitable solid support such as a chip.
  • the solid support can be of any suitable shape such as a bead or a slide and of any suitable material such as silicon, glass or plastic, the solid support is preferably a ceramic chip.
  • the kit may further include calibrators and one or more detecting agents and optionally includes instructions for the use of the antibodies of the kit and if incorporated, the calibrators and detecting agents, for detecting and determining molecules from the CP family.
  • the invention also embodies solid supports comprising the novel antibodies of the present invention.
  • the antibodies of the invention are used for the detection or determination of CP molecules either in herbal mixtures, an in vitro sample taken from an individual or any other substance suspected of their incorporation.
  • haptens provide defined structural epitopes, they are not in themselves immunogenic and therefore need to be conjugated to carrier materials, which will elicit an immunogenic response when administered to a host animal.
  • carrier materials commonly contain poly(amino acid) segments and include polypeptides, proteins and protein fragments.
  • useful carrier materials are bovine serum albumin (BSA), egg ovalbumin, bovine gamma globulin, bovine thyroglobulin (BTG), keyhole limpet haemocyanin (KLH) etc.
  • BSA bovine serum albumin
  • BBG bovine gamma globulin
  • BBG bovine thyroglobulin
  • KLH keyhole limpet haemocyanin
  • synthetic poly(amino acids) having a sufficient number of available amino groups, such as lysine may be employed, as may other synthetic or natural polymeric materials bearing reactive functional groups.
  • carbohydrates, yeasts or polysaccharides may be conjugated to the hapten to
  • the haptens can also be coupled to a detectable labelling agent such as an enzyme (for example, horseradish peroxidase), a substance having fluorescent properties or a radioactive label for the preparation of detecting agents for use in the immunoassays.
  • a detectable labelling agent such as an enzyme (for example, horseradish peroxidase), a substance having fluorescent properties or a radioactive label for the preparation of detecting agents for use in the immunoassays.
  • the fluorescent substance may be, for example, a monovalent residue of fluorescein or a derivative thereof.
  • Immunogen formation for the invention described herein involves conventional conjugation chemistry.
  • each immunogen is evaluated using matrix-assisted UV laser desorption /ionisation time-of-flight mass spectroscopy (MALDI-TOF MS).
  • MALDI-TOF MS matrix-assisted UV laser desorption /ionisation time-of-flight mass spectroscopy
  • MALDI-TOF mass spectrometry was performed using a Voyager STR Biospectrometry Research Station laser-desorption mass spectrometer coupled with delayed extraction. An aliquot of each sample to be analysed was diluted in 0.1 % aqueous trifluoroacetic acid (TFA) to create 1mg/ml sample solutions. Aliquots (1 ⁇ l) were analysed using a matrix of sinapinic acid and bovine serum albumin (Fluka) was used as an external calibrant.
  • TFA trifluoroacetic acid
  • an immunoassay is well known to the person skilled in the art. Briefly, for a competitive immunoassay in which the target analyte is a non-immunogenic molecule such as a hapten, the following process is conducted: antibodies are produced by immunising an animal, preferably a mammalian animal, by repeated administration of an immunogen. The serum from the immunised animal is collected when the antibody titre is sufficiently high. A detecting agent is added to a sample containing the target analyte and the raised antibodies, and the detecting agent and analyte compete for binding to the antibodies. The process may comprise fixing said serum antibodies to a backing substrate such as a polystyrene solid support or a ceramic chip.
  • a backing substrate such as a polystyrene solid support or a ceramic chip.
  • the antibodies can be polyclonal or monoclonal using standard techniques.
  • the signal emitted in the immunoassay is proportionate to the amount of detecting agent bound to the antibodies which in turn is inversely proportionate to the analyte concentration.
  • the signal can be detected or quantified by comparison with a calibrator.
  • CP47,497 (C 7 ) (CAS 70434-82-1) is supplied as a 10mg/ml solution in methanol.
  • Anhydrous dichloromethane (DCM) (5ml) is added and the resulting solution is added drop-wise to a solution of pyridinium chlorochromate (PCC) (167.6mg, 0.78mmol) in anhydrous dichloromethane (5ml) under stirring at room temperature (RT). The reaction mixture was stirred at room temperature for 3 hours.
  • Keto-CP47,497 (C 7 ) 1 (132mg, 0.417mmol) was dissolved in pyridine (2ml) and carboxymethoxylamine hemihydrochloride (CMO. 1 / 2 HCl) (144mg, 1.04mmol, 2.5eq) was added. The reaction mixture was stirred at room temperature overnight.
  • CMO. 1 / 2 HCl carboxymethoxylamine hemihydrochloride
  • MALDI results showed 9.5 molecules of hapten 1 had been conjugated to one molecule of BSA.
  • EDC hydrochloride (10mg) was dissolved in water (0.5ml) and immediately added to a solution of CP47,497 (C 7 )-CMO (Hapten 1) (2mg) in DMF (0.2ml). After mixing, this solution was added drop wise to a solution of HRP (20mg) in water (1ml). Sulfo-NHS (5mg) was added and the reaction mixture was incubated in the dark at room temperature overnight. Excess hapten was removed with double PD-10 columns (PharmaciaTM) in series, pre-equilibrated with PBS at pH 7.2. The hapten-HRP conjugate was then dialysed overnight against 10L of PBS at pH 7.2 at 4°C.
  • CP47,497 (C 8 ) (CAS 70434-92-3) is supplied as a 10mg/ml solution in methanol.
  • First this solution was transferred into 10ml round bottom flask (194ml, 194mg, 0.583mmol) and the solvent evaporated to dryness under vacuum at room temperature.
  • Anhydrous dichloromethane (5ml) is added and the resulting solution is added dropwise to a solution of pyridinium chlorochromate (188.6mg, 0.87mmol, 1.5eq) in anhydrous dichloromethane (5ml) under stirring at room temperature.
  • the reaction mixture was stirred at room temperature for 3 hours.
  • the reaction mixture was filtered on a pad of CeliteTM, washed with diethyl ether and the solvents were removed in vacuo at room temperature. The residue was dissolved in diethyl ether and taken through a small plug of silica gel, washed with diethyl ether and the solvents were removed in vacuo at room temperature to give the desired product, keto-CP47,497 (C 8 ) 2 (148mg, 0.447mmol, 77% yield) as a dark oil.
  • Keto-CP47,497 (C 8 ) 2 (148mg, 0.447mmol) was dissolved in pyridine (4ml) and CMO. 1 / 2 HCl (122mg, 1.12mmol) was added. The reaction mixture was stirred at room temperature overnight. The pyridine was removed under high vacuum. The obtained residue was partitioned between ethyl acetate and HCl (1M) solution, the layers were separated and the organic layer was washed with brine, dried over sodium sulphate and concentrated in vacuo to give the desired product CP47,497 (C 8 )-CMO (Hapten 2) (200mg) as a red-brown oil that was used in the next step without further purification.
  • MALDI results showed 16.03 molecules of CP47,497 (C 8 )-CMO (hapten 2) had been conjugated to one molecule of BSA.
  • EDC hydrochloride (10mg) was dissolved in water (0.5ml) and immediately added to a solution of CP47,497 (C 8 )-CMO (Hapten 2) (2mg) in DMF (0.2ml). After mixing, this solution was added drop wise to a solution of HRP (20mg) in water (1ml). Sulfo-NHS (5mg) was added and the reaction mixture was incubated in the dark at room temperature overnight. Excess hapten was removed with double PD-10 columns (PharmaciaTM) in series, pre-equilibrated with PBS at pH 7.2. The hapten-HRP conjugate was then dialysed overnight against 10L of PBS at pH 7.2 at 4°C.
  • each of Immunogens 1b and 2b of the present invention is with Freund's Adjuvant and the mixture is injected into a host animal, such as rabbit, sheep, mouse, guinea pig or horse. Sheep are the preferred host animal. Further injections (boosts) are made and serum is sampled for evaluation of the antibody titre. When the optimal titre has been attained, the host animal is bled to yield a suitable volume of specific antiserum.
  • the degree of antibody purification required depends on the intended application. For many purposes, there is no requirement for purification. However, in other cases, such as where the antibody is to be immobilised on a solid support, purification steps can be taken to remove undesired material and eliminate non-specific binding.
  • the specific antibodies prepared in this invention are useful as reagents in immunoassays for the detection or semi-determination of CP47,497 - C 7 and CP47,497 - C 8 , in biological fluids.
  • Example 11 Preparation of antibodies to Immunogen 1b (CP47,497-C 7 ) and to Immunogen 2b (CP47,497 -C 8 )
  • An aqueous solution of Immunogen 1b or Immunogen 2b was formulated with Freund's Complete Adjuvant (FCA) to form an emulsion consisting of 2mg/ml immunogen in 50% (v/v) FCA.
  • FCA Freund's Complete Adjuvant
  • Three sheep were immunised with this emulsion (1° immunisation), 0.25ml being intramuscularly injected at each of four sites in the flank of each animal.
  • Subsequent immunizations contained 1mg/ml immunogen. All boosts were emulsified in 50% (v/v) Freund's Incomplete Adjuvant (FIA) and were administered in the same manner as the 1° immunisation, at monthly intervals. Blood sampling took place 7 to 14 days after each boost.
  • blood is collected by applying pressure to the exposed jugular vein and inserting a clean 14 gauge hypodermic needle to remove 500ml of blood per sheep, under gravity.
  • the blood is stored at 37°C for a minimum of 1 hour before the clots are separated from the side of the centrifuge bottles using disposable 1ml pipettes (ringing). The samples are stored at 4°C overnight.
  • Samples are centrifuged at 4000g for 30 minutes at 4°C.
  • the serum is then poured off and centrifuged again at 16,000g for 15 minutes at 4°C, before being aliquoted and stored at ⁇ -20°C.
  • Precipitation of IgG from polyclonal antisera is carried out in two steps, using caprylic acid initially to precipitate most of the non-Ig G proteins, including albumin, followed by ammonium sulphate to extract IgG from the supernatant. This method produces a highly purified IgG fraction.
  • the precipitate is extracted by centrifuging the samples at 1000g for 35 minutes at 4°C.
  • the supernatant is poured off and the pellet re-suspended in 2ml PBS, pH 7.2.
  • the sample is dialysed overnight at 4°C in PBS, pH7.2 containing 0.09% azide.
  • the sample is filtered using a 0.2 ⁇ m AcrodiscTM filter and aliquoted for storage at ⁇ 20°C.
  • the IgG fraction can then be evaluated by competitive ELISA microtiter plate assay, as described below.
  • the wells of an enhanced binding 96 well polystyrene microtiter plate were coated with IgG fraction of antiserum (Antibody 4.1 or antibody 4.2) raised to Immunogen 4 in separate host animals, diluted in 10mM Tris, pH8.5 (125 ⁇ l/well). The appropriate antibody coating dilution was determined using standard ELISA checkerboard techniques. The plate was incubated overnight at 4°C, washed 4 times over 10 minutes with Tris buffered saline containing Tween 20 (TBST) and tapped dry.
  • IgG fraction of antiserum Antibody 4.1 or antibody 4.2
  • the appropriate antibody coating dilution was determined using standard ELISA checkerboard techniques.
  • the plate was incubated overnight at 4°C, washed 4 times over 10 minutes with Tris buffered saline containing Tween 20 (TBST) and tapped dry.
  • Standard solutions of CP47,497 -C 8 were prepared in TBST at 0, 2.5, 5, 10, 20, 40, 80 and 160ng/ml for Antibody 4.1, and at 0, 5, 10, 20, 40, 80, 160 and 320ng/ml for Antibody 4.2, and 50 ⁇ l of each was added to the appropriate wells.
  • 75 ⁇ l of conjugate (Hapten 1-HRP - tracer 1 - see Figure 4 ) diluted in Tris buffer (pH 7.2) containing EDTA, D-mannitol, sucrose, thimerosal and BSA, was added to each of the wells.
  • the appropriate dilution of conjugate was also determined using standard ELISA checkerboard techniques. The plate was incubated at 25°C for 1 hour.
  • TMB tetramethylbenzidine
  • Table 1 Data generated from competitive microtiter plate assays for CP47,497 -C 8 , employing antisera raised against Immunogen 2b (C 8 ) (antibody 4.1 in Table 1a and antibody 4.2 in Table 1b), tracer 1 (C 7 ) and, as standard, ( ⁇ )-CP-47,497 (C 8 homologue).
  • Antibody 4.2 shows a higher IC 50 than antibody 4.1. This is reflected in their respective titres (not shown). Antibody 4.2 may show a lower IC 50 when purified from subsequent immunisations from the same host animal. In the next experiment, each of antibodies 4.1 and 4.2 show a similar cross-reactivity pattern.
  • %CR IC 50, CP47, 497 (C8) / IC 50 , CR X 100
  • %CR is the percentage cross-reactivity
  • IC 50, CP47, 497 (C8) is the concentration of CP47, 497 (C 8 ) that causes 50% displacement of signal
  • IC 50, CR is the concentration of CP synthetic cannabinoid/metabolite/selected molecule that causes 50% displacement of signal.
  • the cross-reactivity data show that antibodies raised against immunogen 2b bind to each of ( ⁇ )-CP-47,497 (C 7 homologue) and ( ⁇ )-CP-47,497 (C 8 homologue) - these antibodies show a %B/B 0 of less than 50% with each of these cross-reactants, using tracer 1 (C 7 ) and ( ⁇ )-CP-47,497 (C 8 homologue) as standard.
  • a similar %B/B 0 of less than 50% is also expected for each stereoisomer in the racemic mixture forming each of ( ⁇ )-CP-47,497 (C 7 homologue) and ( ⁇ )-CP-47,497 (C 8 homologue).
  • antibodies raised against immunogen 2b show a %B/B 0 of greater than 80% with each of ((+-)-CP 55,940), (-)-CP 55,940 and (+)-CP 55,940.
  • CP-47,497 there is a hydroxyl substituent at position 3 of the cyclohexane ring and hydrogen substituents at the 6 position.
  • CP-55,940 there remains a hydroxyl substituent at position 3 of the cyclohexane ring but one of the hydrogen substituents at the 6 position is replaced by a propyl group terminating in a hydroxyl group. It would appear that antibodies raised against immunogen 2b require 2 hydrogen substituents at position 6 of the cyclyohexyl ring.

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EP12180486.8A 2012-08-14 2012-08-14 Nachweis von synthetischen Cannabionoiden Active EP2698383B1 (de)

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* Cited by examiner, † Cited by third party
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10308712B2 (en) 2014-03-27 2019-06-04 Bird Rock Bio, Inc. Antibodies that bind human cannabinoid 1 (CB1) receptor
US11566069B2 (en) 2014-03-27 2023-01-31 Bird Rock Bio, Inc. Treatment of disease responsive to modulation of cannabanoid 1(CB1) receptor signaling
US11421026B2 (en) 2015-09-30 2022-08-23 Bird Rock Bio, Inc. Antibodies that bind human cannabinoid 1 (CB1) receptor

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